I suspect that what they do is reflect a smaller copy of the real pixels over the dark spaces between pixels, to reduce them without blurring the image.
Or at least that’s what it looks like in the promotional images of technology.
Samsung Anti-SDE AMOLED Display solves SDE by applying a grid that diffuses light coming from each pixel and replicating the picture to areas around each pixel. This makes the spaces between pixels near impossible to see. In result, your eyes perceive the diffused light as part of the visual content, with a perceived PPI of 1,233PPI, double that of the already high 616PPI of the previous generation Samsung HMD Odyssey+ [sic].
This could increase the sharpness too, because is more like adding reflected subpixels. This real pixels and reflected subpixels have blacks around (but 50% the size) it’s not a blurred image, I think.